The following table presents the data on comparison of three

The following table presents the data on comparison of three methods of determining serum amylase values in patients with pancreatitls. Test whether these data indicate a difference among the three methods.

Solution

Mean of A = (4000+1600+1600+1200+840+352+224+200+184)/9 = 1133.33

Standard Deviation of A = 1222.37

Variance Standard Deviation = 149142

Mean of B = (3210+1040+647+570+445+156+155+99+77)/9 = 711

Standard Deviation of B = 990.05

Mean of C = 1678.66

Standard Deviation of C = 1910.326

The mean/standard deviation is approximately same hence there is no difference among the three methods